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might be a corona effect, of course, if the electric reaches the corona limit. However, this corona plays no role in the dust collection mechanism. On the contrary, my guess is rather that the corona limit is one of the operating limits of an ESP, since going close to the corona limit might trigger a discharge and increase the risks of explosion in some conditions (carbon monoxide, organic volatiles, flammable dusts, ...) I think this item should be removed from the application section.
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I think the current does go off to infinity in some situations. I think we both suffer from an incomplete understanding of potential. :-) Imagine that the only thing in the universe is air and a small metal sphere. If that sphere has a charge, then it also has an electric field. If that electric
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The DayCor camera was developed by EPRI and OFIL to capture corona and arcing. Since corona is a glimmering periodic phenomena is has to be captured with a video camera. The specialty camera belongs to the bispectral imagers, which means that is uses 2 optical channels: a visible channel and a solar
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I seem to remember that the potential of any point in space is the work done in bringing a unit charge from infinity upto that point. (this assumes that the potential at infinity is zero i think). This is why an isolated conducting sphere in an empty universe can still have a capacitance. Does this
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It's good to explain to the unlucky reader who may be trying to learn something about a topic that it has applications other than being a forum for Wiki formatting wars. Kick a ball three times in a tournament and your place here is assured forever, but list what something is used for and *watch*
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Quote from the application section: "Scrubbing particles from air in air-conditioning systems (see electrostatic precipitator)" I doubt that ESPs can be called an application of corona discharges. In an ESP, the electric field polarizes dust particles making them move to the wire electrodes. There
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electrode is at a high potential and the discharge current flows from this high potential back to the refefence point (which in the case of your lab VGG ,say, would be ground. Which is why I suppose all VGGs and HV systems should be grounded - to have a known reference). I used the word
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instead of potential difference to imply a high potential with repect to the reference electrode (normally ground or the earth. I dont think any current would want to go off to infinity ( what is the potential there?). Hope this clarifies my actions. Pls ask again if
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Yes, the simple difference is that with a corona discharge, the electrons get forced off the metal into the air, but have no place to go -- there's not a closed circuit. With an arc, there is a closed circuit from one conductor through the air to another conductor.
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blind UVc channel (240-280nm). The images are simultaneously taken and are overlaid to produce output that shows the corona source (the UV source) in its original (the visible picture) set. Pictures and video clips can be downloaded and watched from
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without the "difference" at the end. You said "by using the ions generated to pass the charge to a lower potential (which may be earth)." Couldn't that also say "by using the ions generated to pass the charge to a lower potential (such as the
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After reading half of this article, I have coem to the decision that someone needs to make this article more comprehensible to the common person... If someone could do this, I think it would be greatly appreciated by many people.
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Just thought:. if the potential at infinity is zero, then an isolated sphere at a high voltatge would indeed start to corona. The only problem is: how do you charge the sphere in the first place if it is completely isolated:-)?
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It's currently overobsessed with mechanism, and would benefit from people working on the history applications, etc. This is because of my natural inclination, which I have to fight, :). I won't be h] 17:48, 14 Sep 2003 (UTC)
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You put charge on it. Charge isn't relative. You mean if the only thing that existed in the universe was the ball? So how did the ball get there? It's just an imaginary problem so imagine that you are putting charge on
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Although there are various methods of particle charging...for industrial precipitator applications corona charging is universally used as being the most efficient and cost-effective approach.
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Potential, from what I have read, has no meaning by itself, it is only meaningful to talk of a potential difference. I think the important point here is that corona is dependent on
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field is strong enough, the air will breakdown and a corona will form around the sphere, regardless of the presence or lack of another electrode. Does this sound correct? -
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I'd like to have a clearer description of the differences between arcs, sparks, and corona discharges. In air, do they have different colors? I remember playing with a
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or infinity)."? Because a potential measured by itself is defined as the potential difference between that point and infinity, according to my discussions elsewhere. -
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Hehe. I thought "how did he type the pound symbol accidentally?" Oh, when I press shift+3 I get #, which is also a "pound symbol", American style, I guess. -
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says Zaengl et al did it, so I will do some more research for those equations. Anyway, maybe we should just list the equations in this article instead?
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They are marked as public domain on the web page. If anyone thinks that any of them might be appropriate in the article, please feel free to use them.
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No. The great thing about
Knowledge is you don't have to guess, or speculate...you just find references. Google Books says that Page 22 of
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confuses me. It seems to say that potential is a relative measurement just like potential difference. I was under the impression that
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Yes, Omegatron, the purplish fuzzy discharge is a corona or brush discharge, and the white or yellow momentary discharge is a spark. -
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I have pictures of corona discharge on corona ring of 500 kV overhead power line, if appropriate, they can be placed in the article.
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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643:{\displaystyle \left({E_{c} \over \delta }\right)-2\left({E_{c} \over \delta }\right)E_{0}\ln \left-E_{0}^{2}={K/C \over \delta r}}
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Nobody said anything about a deadline. This has nothing to do with applications and everything to do with
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Light current, can you find the name of the paper (reference #36) they were referencing? I think it's on
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article, but I see that Peek's empirical measurements have been superseded by slightly better equations.
1018:, as I have said, and you have failed to address. Please focus on why we should ignore these policies. –
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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I have some (IMHO) extremely cool pictures of corona discharge from a home-built ozone machine here:
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on
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page when I came across some physics I didn't understand and now do (I think)! :).
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WS.Zaengl and N.U Nyffenegger. Proc. 3rd Int. Conf on gas
Discharges, 1974,p303
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https://web.archive.org/web/20050308014911/http://www.ee.vill.edu/ion/p61.html
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Are electrostatic precipitators (ESP) an "application" of corona discharges?"
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Hah. I didn't even notice that Zaengl wrote that book, too. Self-citing? -
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I found an ISBN, but it actually refers to this edition, printed in 2002:
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was an absolute quantity depending on charge, geometry, and so on, and
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electrodes were at a high potential. THat was not correct. Only
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Corona discharge on corona ring of 500 kV overhead power line.
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Corona discharge on corona ring of 500 kV overhead power line.
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for additional information. I made the following changes:
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High
Voltage Engineering by E Kuffel, W S Zaengl, J Kuffel
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Selfmade
Pictures of Overhead Power Line Corona Discharge
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Just entering equation 5.111 for cylindrical geometry:
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This article is getting pretty big already, though. -
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None - it's an unabridged reprint of a classic work.
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Electrical operation of electrostatic precipitators
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